Part Modeling > Datum Features > Coordinate Systems > To Create a Coordinate System
  
To Create a Coordinate System
1. Click Model > Coordinate System. The Coordinate System dialog box opens.
2. Select up to three placement references in the graphics window. References can be surfaces, planes, edges, axes, curves, datum points, vertices, or a coordinate system.
3. Click OK to create the new coordinate system with the default orientation, or click the Orientation tab to orient the new coordinate system.
 
* If you have selected a vertex as an origin reference, a default orientation is not provided, and you must manually orient your coordinate system.